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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7229a8dd6b2ce435a7c5f2a1a0cffb0dcd733ec667e0adb200ce6c2e8e646c' 
  AND token = 'IBOiaQxUOw0tP1gjkLDm180WO2TskrSRMfuP9KoL9KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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