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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603baa9320fa1ad1d5be17af6ece2ceb60ff8ab5128de5f89a36197eba7c72a3' 
  AND token = '75Wa8R21TQhCEmFUu1cjJP1q9xOHYZwa2YxK1Jv9z5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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