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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6e3fea8f88381cf0018490606e53fbbeef535864eb5f941d8cfe46955b6ae9' 
  AND token = '2Fn4HK5psaNIok7PJm1fAcQZ888YE+2zU7QOUcStrgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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