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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553fc6b1c2394c317cd4cd614e067c44c900962a10545638faf64dbd5763607c' 
  AND token = 'kLIL5sFigNCl9/rKIHW8T4D7vQjfs8A6c7BK3Sfi53s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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