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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e18cfad0bd17403f5f31b8f31c6651ec2c7f44ca9a77d8a24ef89e34c0a551' 
  AND token = 'LjiWIbEdidTnkX2Lx0r5k67laS+INXHF+dFwdyix+yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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