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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaba44935ca2ec4a384d97d0085efeca8e4b894860e7f88907f94a3c047aa1dc' 
  AND token = '6CB5Wdonw6Ae3Pc3fyWRZ8dAuUeGaajN/ohx5+ypy24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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