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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f86db725e4af000ed7e62eb0eafc8b44a73e4092277b381b4caf5bb6eea9c5' 
  AND token = 'dHFDedH/+EM4OLPacoPfQYfJ8GZ3+URq9tmBSa0RSSA=' 
  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"
    }
  }
}