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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5bf2af743007bbda0c30b2a4e640bc5fa0a389b41da0230addb996ec05499c' 
  AND token = '3BQYYs2Iy3z54qg//BnERw9do7BEhAypJSgfFc0qJXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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