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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fec5e1f2917d6dab439743fd5ddf5fd306a2c5a21f9e63f2792161b77f95afa' 
  AND token = 'u87jMq86dwl6CRNRz8X0NiOoit0V8cyP0IBkiP2n0j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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