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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7277ad76dac90443e5e2b9e7f03416c9f5f0b8fd96c63f07f76fe4d5a5887ac' 
  AND token = 'w97DvWeM+Qq4CNTLp/E+lvuCYA0mXBO83zUDoSRNAtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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