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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ca96123d301eec8eca73542ab96486f469155db43d1da3014a739829a7c3f3' 
  AND token = '1i9dYpPvXcQE4R8A5L2xennF7eNonfxiovKRI1TCLp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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