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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3609837c204dba1d0df05501bd14d79dde0bb5025197dbddf3ef3c85673a61' 
  AND token = 'GcbTD0UMtYJPRunSKT6gB39nUOWY7TViNY5Gu81MVck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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