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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3e05c7b801d9b2e91aecea21e10ef2af53f9d6ed423e8d131870381a35d72e' 
  AND token = 'QfNd4Bf31OoTicS10a3j/4PcA1hZC9TwOmlypXdMyf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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