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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55743ba22edb7ad0c91c5032bf6fef47bf34d4e70b8ae466e8aa35b94aa1da1a' 
  AND token = 'q4BikQ3d/skMYLrRir1XlQGrulXHBG+7pZ0eupD3RX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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