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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d29fcbf0efc0978b76040e9418e96cc69111f0d638763b40d965d788ea83bf' 
  AND token = 'q/cX1fU/2uaNYGKkDSUrtTNIZAK6p1B9xTZu5OPqeGw=' 
  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"
    }
  }
}