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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d52763d53779734fcf1ed44084ef55cb8c363d4066e9e0c8d0d1abf6ec1cb5' 
  AND token = '1N858mdXpvPnhenW+Eev7R2GGCfc6pGjYs0YMO7U2Oc=' 
  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"
    }
  }
}