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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec30ea755fbcec98d0b9bd5d3c48a964c0ea03fad47be2e2b457827f6472da80' 
  AND token = 'x0oIpf0LDiu+D+3MXSJGox0GOwG7+WQg+ph/s5UuTtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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