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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f7be0b30bf9c8d4a9d990e4f62eb685f10f7c37c21c85dbeecda5809f0e940' 
  AND token = 'VfK+pfKv7L6vmN4l+BMwjNQL9ibBwBwhEe1HewmjmRo=' 
  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"
    }
  }
}