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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89146e523c9971daf43ee1a8d6ecea011a0078b8f17d1e4664c78193a246bfdf' 
  AND token = 'yzskX4RYSbe0Lpa0U1VQwy8n20as3hFv23lEepnLdoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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