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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763e31cd5678eb11186f47c65b9694f43d53a136dde8ba83ed30fb1ea7cc7153' 
  AND token = 'oVKBmaI6SR9Mkph2TbpxWPCDMpGiZEoMaWDC+FQ5xpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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