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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b86be6767d72690aa8052968c423082d4a9b40a9811f5b09aa3a08756f400ea' 
  AND token = 'MqoN+wQf/Vg3tI2tJ8n09KaxKJlC8Ood37M8dgpfVeM=' 
  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"
    }
  }
}