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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641a9fcc21abea2272036493cc4e69116fca66e2ef5e6e82e878ed8cfd63a4d5' 
  AND token = 'q/znvn4phiqWYA2pcAI786kTcYyzIGQovdBbjCE21g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}