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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c344c97c56aae9b374f99d3b8e9017be381df8af012fdc1a5c8e15dcc6197f5' 
  AND token = '2Oog4Cw/rIiDBs0L4gOZgfohWh1EC74wvDqDREOCiPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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