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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f747132fa5e8a3c5cc19e81ecf219cd9bb93a253b63776e953887168632b6f' 
  AND token = '5NuwFsLE4+lp5PQW4FlL2xvoBx1R+lq51IAbVffC9+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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