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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e42dad1a6ad8a2d6c05993ff824efd9fab945cacbbfff9cc3b5bc4195036564' 
  AND token = 'kZbwdUZ4VggMaZcuUuxc5UD/EzkDqbTm45goHaBMkqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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