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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bbe19cd55049b53f4c335fe5b13b7539292cf44a58be4927a0340f5ac29bbc' 
  AND token = '0SqKWu3h6fofF03dgt77EaW3vNgllP6h8UEaejp4ltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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