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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d00bf5d736e0ea02fd071cc64240bb365040f89e231710f3df87799e88e4bf' 
  AND token = 'gaaRpaxkZGFwe0vvouzq1aau4IUUhE5mKKtgfQ78xrg=' 
  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"
    }
  }
}