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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347c8b874c4862eb21a39ebba6a80194ff4310ac2d9a5094fd363440539f4d0e' 
  AND token = 'rTrvw97LTxy1E9+8wffjFE0wL1WPvZwGmJwlFJ9/AJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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