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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99214b0dc883691b2660e3f9c50fef1cfee233ed674025f0827c4bf4ac2986ab' 
  AND token = 'cH8USSImNji+KyPLAX/sb2tOQ/5553R5H5sAjxzPtyE=' 
  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"
    }
  }
}