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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8429a47c35aad2b44bf4b139909e86fae0435c2fdb1bc30d9cb7b728d2c76e3c' 
  AND token = 'vUAITO4Cykw/v6YDSNzV4Ij1ahrTa4mrr/SWHiqJfa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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