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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e384a097cead32f78c74e24ce8699963b9016bf9af6a214c76b12f567f3b6c' 
  AND token = 'CfALQkg1sxXFnMqpKOFUN3bLNLcjHJlXXDfZxPDi1oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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