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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c069dbb5f938ea02a3c48b2457e1d249b7a35b990d2b8b57acf4322ed53d6b18' 
  AND token = 'DCWI0QTRqBA2fQ9ag+bW9MRXPqjU5XA8rcS0utKZr4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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