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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42ecb17e8d58f3734e45ba7d286adde496df4bcfc81c9c503e1bf8b2dd582c3' 
  AND token = '81scl7CUTm3FkNe8ti+/9xiExjgRRAmBCJYInNpNfSI=' 
  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"
    }
  }
}