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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b9dabad6c2e73ce324a933e7c615cbad31d0b9c06903699a8e6a4813904dcf' 
  AND token = '6Td+E3XyIBG94jilPCs8CcMcBp1OJ1tayUhmRKIk8pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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