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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa6ffe291f6f1a4c80447664260dbf3b2391f295000ec268d442ec6fc42b548' 
  AND token = '8eZ8wUIV4Icl5hIVZtdGSyqjOKQWOz5XnMhpupWISEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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