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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f7e621d8c3e9368afa90855e30b32e22110302a3cf6fda1dbdde91cc3b3963' 
  AND token = 'Ek8WkRE0A6EVQoh986c+wd8asZpvt166q+kWVekD6Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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