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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9aed2e499098af814e9c2753d9ab94a20e28553ab774a0b2d498ea083b8b0e6' 
  AND token = 'pDyzr7tvLY7L1W7DvgQiNT7ISz+A+nGRR1j8UR0sid4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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