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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158ce706f4ae4a337e434f511b674dbb4c7a40d1a76c6986e155336c8189b527' 
  AND token = '4jnU1p1kkbnCgnEF2ZBHEekoFTYRAHW0ZjWwjuAF8IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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