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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9e77e15cb7ccfbdbb5e1a6bd19a4f2f0abbe616d887779e7c9d759dec8b88e' 
  AND token = 'ZX8gs3vf4/edtfPsDtrBxd79ugPGESi4cZeQGhq4t/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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