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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f81c23cb09d16ab2a55f7fbb8a84422a387edb6b9a59f75621cf2b1a6778d6' 
  AND token = 'vh41B2h7xQcu5NfJGvX2MD9/9TJ7ghIETYbIm6rzY7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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