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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dbaa8a3f1747c3ac13e69fabb620b39a6e845f177bd990385ee5bd5e0370c3' 
  AND token = 'mAGbzuYWIyF4Ybljly5t5YX1qu5stdYIGDUNM33DpE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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