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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5220b0455c6908910485bb03374bdea33ae8fe55fec2b2428c1d1fb448f2a90d' 
  AND token = '9pP/z9q9gT3G5+AtFZbDDyfw04oSAGObY1jlMsQcPIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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