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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc07a33e7f37b674d8717072c98441c8ac22b52cd8d88e7b22d6ca3290030e05' 
  AND token = '7oNnRZj7HyBY6f8lRU0n2nd6zDOgAT+qQ0gndCi8+9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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