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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c2cf3e72ceba99d0eb67c61f571714ef4ce0238a7acd5f2212439914f7ea98' 
  AND token = 'g0CTySLzAD3Th7t5Al6Vy6sCnwG6uDCWW5pU4aQMO/U=' 
  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"
    }
  }
}