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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c628cb7073b28d9a3c8d14f22d5debf13f709a2313f5c8e40488e9d21a00e1c0' 
  AND token = 'RABZlgyMGR5E1uN+c4qq/CxdtPz4RumzFwPlH8OSiss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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