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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4916c47746c032a6f4009a62d263b8240a3eab5e68a8b839e54602c0e680f5' 
  AND token = 'fBFELbzof3F0D/lWFC/hv9zw6hkg7eJ4koGF9ipfkiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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