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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b40b2cc5591c670b3067ee53fe8373c484c05eea8b852fca9aaf2cd488f5f92' 
  AND token = 'sgWGb0Jnpex+jnYuBsdM45+0q4Za7jYzv7uDZEDuik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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