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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6322df0588fa1621125851e900f3a7adffe4fe30c49f436e6d7c9f92fbd397a8' 
  AND token = 'dbXb0Dl564VLul+laupWlDF2lLSCM4pdmND/uqNE59g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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