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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83596919857fce3f642559cb7f322fc6743e51df33a344b8929c0064b561c5f0' 
  AND token = '4AcQ3oZiI2AM7g7C2G8CzIQKG8llcpgvn0Gu72anecA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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