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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8d66e29d8690e45859f354af0381af3e356fc58529e2928dd1530863aa9a1c' 
  AND token = 'Wnw4XZUygSzBusuAVoXsvbTAcia1/T7l6ujH7M78ti8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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