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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d5f423af5fc403e1ab292796dc725c92650daa33ac43d4c0eadcf969f6086a' 
  AND token = 'g8CK8ei4JbRc21A5m+VIFZ5h6XA/DkfMdjNp6Uv1OTQ=' 
  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"
    }
  }
}