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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81c2dea3e753b3ffa2832d46f92ac0038bd53cca459842de5a7fc06255ac2f1' 
  AND token = 'arvL09diH4/IgbonDfyJUHSlzsH6JhmzeuxIgArR8Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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