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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade31fdab6bf6c5be4eaa26b2d013ea6ce18e7acb7caf4db2c73c708a5e03322' 
  AND token = 'MOI46nJYt8IDrvF4yYfBUd394CQXWtWgR4pzWB2tq7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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