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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5788a04a10f4f2f71ce59b987442ea7c61f20da0b879498f86054fe5eb7e4fcb' 
  AND token = 'r7S9vygtPtCo+sdMNz4XU0WO08UPf+/qkcXk01S9+gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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