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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa89ec4f43302c8c8daea9adca43c19cf86d93d080ae73dccc709ae68a7539b' 
  AND token = 'bAqk/W5l+PYNs4VjABPQUvhh/sFCR/miP/Q/N2ifWiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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